title: [Seasonal variation and spatial distribution of typical organochlorine pesticides in the atmosphere of Hexi Corridor and Lanzhou, northwest China].
abstract: Air samples were seasonally collected in Hexi Corridor and Lanzhou, Gansu province, using polyurethane foam (PUF) based passive air samplers for a year and determined hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs). Atmospheric concentrations of sigma HCHs (alpha-HCH +beta-HCH +gamma-HCH +delta-HCH) and sigma DDTs (p,p'-DDT + o,p'-DDT + p,p'-DDE + p,p'-DDD) were 86.22 pg x m(-3) and 34.06 pg x m(-3) in Hexi Corridor and Lanzhou with background concentrations of 54.41 pg x m(-3) and 21.56 pg x m(-3), respectively, which were lower than previously reported values elsewhere. In general, the seasonal pollution characteristics of sigma HCHs and sigma DDTs exhibited higher levels with the average concentrations of 127.4 pg x m(-3) and 47.06 pg x m(-3) in autumn, respectively. Furthermore, relatively higher residual concentrations of HCHs and DDTs were found in Jiuquan, Anxi and Zhangye, relating to their more arable lands and more intensively historical usage. Source apportionment indicated HCHs were mainly originated from historical technical-HCHs residues and recent Lindane usage. Recently introduced technical-DDTs was highly responsible for DDTs contamination, whereas the higher concentrations of o,p'-DDT observed in Jiuquan and Anxi may be attributed to dicofol usage. In addition, human exposure to HCHs and DDTs in Hexi Corridor and Lanzhou via inhalation could be relatively low.
authors.affiliation: College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China. dingzhongyuan@126.com
authors.forename: Zhong-Yuan
authors.initials: ZY
authors.lastname: Ding
authors.forename: Xiao-Xuan
authors.initials: XX
authors.lastname: Mao
authors.forename: Zi-Long
authors.initials: ZL
authors.lastname: Ma
authors.forename: Hui
authors.initials: H
authors.lastname: Tian
authors.forename: Qiang
authors.initials: Q
authors.lastname: Guo
authors.forename: Tao
authors.initials: T
authors.lastname: Huang
authors.forename: Hong
authors.initials: H
authors.lastname: Gao
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Gan
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D002681:China; D002947:Cities; D003634:DDT / Q000032:analysis; D004784:Environmental Monitoring; D001556:Hexachlorocyclohexane / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D012621:Seasons; D062206:Spatial Analysis
chemical_list: D000393:Air Pollutants; D006843:Hydrocarbons, Chlorinated; D010573:Pesticide Residues; D001556:Hexachlorocyclohexane; D003634:DDT